碳酸盐分解反应的产物是氧化物以气体状态放出,属于()反应。
参考答案:可逆吸热
Security was such a major concern at the G8 Summit that no journalists could approach the meeting zone without ________ the special pass.[ ]
A. producing
B. issuing
C. commanding
D. involving
以下属于临时水工建筑物的是( )。
A.导流墙
B.挡水大坝
C.电站厂房
D.围堰